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+SET GLOBAL innodb_fast_shutdown=0;
+# restart: --innodb_undo_tablespaces=2
+SET GLOBAL innodb_undo_log_truncate = 0;
+=== information_schema.innodb_sys_tablespaces and innodb_sys_datafiles ===
+Space_Name Page_Size Zip_Size Path
+innodb_undo001 DEFAULT DEFAULT MYSQLD_DATADIR//undo001
+innodb_undo002 DEFAULT DEFAULT MYSQLD_DATADIR//undo002
+innodb_temporary DEFAULT DEFAULT MYSQLD_DATADIR/ibtmp1
+create table t1(keyc int primary key, c char(100)) engine = innodb;
+create table t2(keyc int primary key, c char(100)) engine = innodb;
+connect con1,localhost,root,,;
+begin;
+insert into t1 select seq,'a' from seq_1_to_20000;
+connect con2,localhost,root,,;
+begin;
+insert into t2 select seq,'a' from seq_1_to_20000;
+connection con1;
+update t1 set c = 'mysql';
+connection con2;
+update t2 set c = 'mysql';
+connection con1;
+update t1 set c = 'oracle';
+connection con2;
+update t2 set c = 'oracle';
+connection con1;
+delete from t1;
+connection con2;
+delete from t2;
+connection con1;
+SET GLOBAL innodb_undo_log_truncate = 1;
+commit;
+disconnect con1;
+connection con2;
+commit;
+disconnect con2;
+connection default;
+SET GLOBAL innodb_max_purge_lag_wait=0;
+set global innodb_fast_shutdown=0;
+# restart
+drop table t1, t2;